I would describe it as an inherently animated medium. I find it difficult to keep an unchanging image in mind, though it does make an excellent meditation exerc

I would describe it as an inherently animated medium. I find it difficult to keep an unchanging image in mind, though it does make an excellent meditation exercise. My mind's eye isn't like a framebuffer that I render to. Trying to visualize a direct analog of a still image is difficult, feels unnatural, and requires concentration. Moving scenes are easier, even if the objects are unchanged. It's easier still when the nature of the objects change too. I think it must exercise the brain's simulation and prediction hardware - it's easier to render and it has a smaller memory footprint. I can "look" at a sphere, but after only a short while it starts to change, move, or rotate as though my camera is changing position. It might spontaneously change color from "red" to "blue", or start to squish into a spheroid. Or change into a scoop of mint chocolate-chip ice cream. Or other elements might come into view. The changes aren't random - it feels like the scene takes input from a stream of thought just on the edge of consciousness. Maintaining the integrity of the scenegraph - the state and location of the objects requires constant corrective input to return it to its desired configuration. This is a separate and distinct act from the concentration required to "view" the scene in greater detail. The bigger the scenegraph, the harder it is to stop the motion. I can visualize what starts to feel dreamlike in its detail and complexity, but it becomes impossible to freeze the scene.